Sailonline.org - Online Sailing

Facebook

Login

Support Sailonline

If you haven't already - join the SAILONLINE YACHT CLUB!

Please also consider making a donation - all amounts are greatly appreciated!

Tweets by @sailonline

Board » Technical Support » distance to go

Posted by Olive Posts 4 Registered at 2012-12-24 20:22:03	2012-12-30 09:18:14 - Re: distance to go
	That's all indifferent since the nonsense numbers lead us all astray. Who cares if it all makes sense when we "get close." Why play along at all. Sheeeze...
Posted by RainbowChaser Posts 2656 Registered at 2009-06-14 09:44:50	2012-12-30 09:22:52 - Re: distance to go
	evilonod - I can sympathise with your frustration, but rest assured there is no-one getting any advantage here. It really is all about the shape of the globe and how SOL's calculations are made. Please don't give up on us!
Posted by hmm Posts 118 Registered at 2011-11-03 13:35:22	2012-12-31 10:06:10 - Re: distance to go
	I believe I have now found the root cause of this problem. I have described it in my blog: http://blog.sol.hmm.iki.fi/2012/12/scoring-problem-on-races-crossing-idl.html
Posted by outlaw Posts 33 Registered at 2012-06-01 13:37:55	2012-12-31 17:07:52 - Re: distance to go
	As for the DTF calculations, how about simply calculating GC bearings to the next couple waypoints, then using GC distance to the best WP based on bearings + rounding direction. I suspect this may lessen server load as well. (see pic) Attachments world.jpg (155.6 KB)
Posted by hmm Posts 118 Registered at 2011-11-03 13:35:22	2013-01-02 11:45:03 - Re: distance to go
	I have also tried to explain the DTF calculation in more detail in my blog, check the post here: http://blog.sol.hmm.iki.fi/2013/01/dtf-calculation-problems-near-polar-area.html As I say in the post, the DTF calculation is run every 15 seconds for each boat, so changes to that code have to be made very carefully not to cause the server too much load. However, that doesn't mean that there will not be improvements in the future. It just means that the changes have to take into account also other things than only always getting the best possible DTF for the boat.
Posted by Rod Posts 392 Registered at 2010-06-24 22:30:48	2013-01-02 14:26:49 - Re: distance to go
	Is it not possible for each player (sailor ?) to merely run the measuring caliper tool, in Great Circle mode, between the next turning mark and the current position of any boat (including his own) in which he has an interest? I just do not understand the cause of all this worry over such a trivial problem. Congratulation to Markku H. for solving the causes of the SERVER'S problem, but it is really not a problem to the SAILOR. If it breaks, it's not strong enough--if it doesn't, it's too heavy.
Posted by outlaw Posts 33 Registered at 2012-06-01 13:37:55	2013-01-02 18:32:12 - Re: distance to go
	> the DTF calculation is run every 15 seconds for each boat This is unneeded, do a proper distance calculation every 16 steps, and use increments (VMC * timestep) inbetween. That means only one in 16 boats gets a full calculation for a given timestep. The same could be done for roundings, maybe. --- Zuletzt bearbeitet von outlaw am 2013-01-02 18:33:23 ---
Posted by hmm Posts 118 Registered at 2011-11-03 13:35:22	2013-01-02 19:25:05 - Re: distance to go
	To do that the VMC (and the course which to calculate VMC for) should be calculated for each boat every 15 seconds so it's not clear if it's easier to it that way. The VMC, VMG etc numbers you see at the client are calculated at in your own computer and are thus "cheap" for the server but on the other hand are not available there directly. It's good to have different ideas how to improve the calculation but as Rod wrote earlier I don't see it as a major problem now.
Posted by Hasseballad Posts 17 Registered at 2008-11-15 11:51:32	2014-05-25 07:33:33 - Re: distance to go
	Recent experience at RTW2014-leg4. The "rounding line" ref. hmm for Cape Horn has a limit at 83S & 34W. Why not move that limit to say 65S & 64.2W or the exact W pos. on the "rounding line". Wouldn't that be a simple improvement for the boat position at the Horn specificly. Rgds Hans

Page: Previous 1 2

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Southampton to Punta del Este 2024

Sailonline is delighted to offer our sailors a 'reversed' Atlantic ocean race. As the RTW championship Atlantic part takes a detour to the Bahamas, we will offer you a reversed course as we will not do the 'usual' leg this year either. It is the July edition of this year's Ocean Championship. Our boat is the OD_65v3.
PRIZE: SMPF
Race# 1820
INFO from brainaid.de
OD65 PARTICULARS
WX updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ3 - OCCH - SUPSOL - SYC
Race starts: Jul 01st 11:00 Registration Open!

▶ Flash

GO TO RACE

Tall Ships Races 2024 - Klaipeda to Helsinki

Welcome to the first of three virtual Tall Ships Races on the Baltic Sea which are being organized in-real-life by Sail Training InternationalThis first race is from Klaipeda, Lithuania to Helsinki, Finland; circa 240nm in Sailonline’s stately fanciful Full Rigger.
NOTE: Starts and Finishes in tall ships racing are always offshore to avoid conflict with shipping and shipping lanes.
Race #1811
INFO by brainaid.de
Full Rigger PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: TS - SYC
RACE CLOSE: Saturday,
July 6 at 2300 UTC.
Race starts: Jun 27th 14:00 Registration Open!

▶ Flash

GO TO RACE

Haida Gwaii 2024

We will end the second quarter of the ARCH competition with a 390nm race around the Haida Gwaii islands (literally "Islands of the Haida people"), also known as the Queen Charlotte Islands. This is an archipelago located on the northern Pacific coast of Canada. In SOL, we last raced on this route in 2012 and few people remember what happened there. Prepare your Riptide 50 well, it's going to be a lot of fun.
Race #1819
INFO from brainaid.de
Riptide 50 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
ARQ2 - ARCH - SUPSOL - SYC
RACE CLOSE: Wednesday,
July 3 at 2300 UTC.
Race starts: Jun 24th 17:00 Registration Closed

▶ Flash

GO TO RACE

Newport Bermuda Race 2024

The 636-mile biennial Newport Bermuda Race is one of the oldest regularly scheduled ocean races, and with the Fastnet Race and the Sydney to Hobart Race, it is one of the three great classic races of the yachting world. Founded in 1906, this 53rd running of the Bermuda Race can again also be participated in online.
Entries are invited for one of the four divisions:
Double-Handed Division:
Jeanneau Sun Fast 3600
St. David's Lighthouse Division:
Santa Cruz 52
Gibbs Hill Lighthouse Division:
Judel Vrolijk 62
Finisterre Division:
Riptide 50
Details for each yacht are available in the ‘Particulars’ links below. As in real life, you can only sail one boat in one division, so choose your virtual yacht carefully, and because of the unusual (for SOL) 4-division nature of the event, please note results will not count towards any Sailonline rankings.
Race #1808
INFOby brainaid.de
Sun Fast 3600 PARTICULARS
Santa Cruz 52 PARTICULARS
Judel Vrolijk 62 PARTICULARS
Riptide 50 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: None
RACE CLOSE: Friday,
July 5 at 2300 UTC.
Race starts: Jun 21st 17:05 Registration Closed

▶ Flash

GO TO RACE

Auckland to San Francisco 2024

Welcome back to Auckland as we continue our Round The World voyage. This 5600 nautical miles race from Auckland to San Francisco, first sailed in 2023, is the third leg of the RTW, proposed by SOLer ita10267. It is also the June edition of this year's Ocean Championship. Our boat is the Swan 65, as in all RTW races this year.
PRIZE: SMPF
Race# 1790
INFO from brainaid.de
Swan 65 PARTICULARS
WX updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ2 - OCCH - RTW - SUPSOL - SYC
RACE CLOSE: Tuesday,
July 9 at 2300 UTC.
Race starts: Jun 03rd 11:00 Registration Closed

▶ Flash

GO TO RACE

Go to race archive

SYC Ranking

View full list

Series

Mobile Client

SYC members have the benefit of access to our mobile/lightweight web client!

The mobile client